Mini Satellite Attitude Determination and Control System
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Reaction Sphere


      Controlled by a patented magnetic field design, a spherical motor is capable of spinning in X, Y, and Z axes. Moreover, bias-currents are applied to each phase of the motor, this enables the motor to combine 3-axis magnetorquers into this device as well.


Application: Attitude Control

      Every satellite in orbit requires precise orientation control along the X, Y, and Z axes. This is the so-called attitude control, which is essential for optical sensing satellites and broad-band communication satellites. To achieve this, we use a tactical grade gyroscope and fine sun sensor as the attitude determination sub-system; the spherical motor functions as the attitude actuator. 


  • Weight: < 400g
  • Dynamic Balance: < G 0.4
  • Max. Power Consumption: 1 W
  • Power Consumption when no torque output: 0.2 W
  • Pointing Accuracy: 0.2 degrees when the sun is capturable; 1 degree when the sun is not capturable
  • Max. Momentum: 10 mNms
  • Max. Torque: 1mNm
  • Interface: I2C, UART
  • Lead Time: 4 weeks
  • Lifetime: 3+ years in LEO


    Nowadays, the space industry has faced two major obstacles, rocket and satellite costs. To tackle the second problem, satellite minimization is key. Among all sub-systems, attitude control devices are the last components that can’t shrink their size due to physical limitations. Thus, we developed spherical motor technology to replace three motors by only one. Within our unique design, this device can have 1/3 weight, size, and power consumption compared to the traditional system. Finally, we believe we may enable the space industry for wider commercial applications by our invention.


Thomas Yen

Co-founder and CEO
  • Business Development & Hardware

  • Entrepreneur in Residence, Infinio Capital​

Sam Lee

Co-founder and CTO
  • Motor Control & Firmware

  • Electrical Engineering, National Taiwan University


Austin Chang​

Co-founder and COO
  • Finance & Software

  • Computer Science, National Taiwan University of Science and Technology


Luke Hou

Co-founder and CPO
  • Mechanisms & Manufacturing

  • Electrical Engineering, National Sun Yat-sen University

Min-Fu, Hsieh

Technology Advisor
  • Professor, Department of Electrical Engineering, National Cheng-Kung University

  • Mechanical Engineering Ph.D., University of Liverpool​

K.S. Pua

  • Control Engineering M.S., National Chiao-Tung University

  • Chairman & CEO, Phison​ Electronics Corp.

Eric Lin

Business Advisor
  • Managing Partner, Infinio Capital

  • Founder & COO, Symbiosis Creative

Alicia Hsu

Legal Counsel
  • Columbia University, School of Law, USA (LL.M.)

  • Former General Counsel of Taiwania Capital

  • Lawyer, licensed in Taiwan and New York State, USA


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